Affiliations: Chair of Air Transport and Operations and Section Head, Senior Member of AIAA, The Technical University of Delft (TUD), Kluverweg, The Netherlands | Assistant Professor, Air Transport and Operations Section, The Technical University of Delft (TUD), Kluverweg, The Netherlands | Masters Student, Air Transport and Operations Section, The Technical University of Delft (TUD), Kluverweg, The Netherlands
Note:  Corresponding author: R. Curran, Air Transport and Operations (ATO), Faculty of Aerospace Engineering, The Technical University of Delft (TUD), Kluverweg 1, The Netherlands.
Abstract: This paper gives insight in the development of a Value Operations Methodology (VOM) that can be used to support Value Driven Design (VDD). The VOM establishes expressions for operational value levers that are incorporated into a weighted value function. This value function is then used to optimize the design variables that are incorporated into it so that the design process is actively driven by value assessments that provide design decision metrics. However, the VOM is generic in nature and has a much wider range of influence to the design process for any engineering product. The methodology is verified by means of a case study, analyzing the value difference between the Boeing 737-200, Boeing 737-800, Embraer ERJ-145 and the Airbus 319 as part of a use-case study. In fact, the fundamental conclusion from the work presented is actually that VDD simply promotes the sustained application of the main utility values that were originally recognised but which, due to the complexity of the product and enterprise, tends to be disaggregated into isolated requirements. Ultimately, this leads to optimisation at a sub-system level and that is especially unacceptable for a complex system (with many sub-systems), whereas the re-focus of VOM helps to significantly shift the design effort back to creatively solving the main goal, rather than simply and somewhat robotically making sure the requirements are satisfied. The verification and validation work presented is recognised as indicative but the authors believe that it is extremely significant in pointing towards the potential gains from sustaining a more holistic appraisal and approach through-out the design process. Notwithstanding, the key message of the paper is the need for value modelling within engineering so that we are in control of the consequences of what we are actualising, where value is realised through operational delivery and excellence. This paper has presented a broad methodology in opening up a significantly different approach to aircraft design that is both performance and economics driven while also incorporating other crucial drivers of a much more holistic nature, proactively rather than reactively.